Răspuns:
a=144
Explicație pas cu pas:
[(7×a+144):a+132]×5-600=400:4=100
[(7×a+144):a+132]x5=100+600=700
(7xa+144):a+132=700:5=140
(7xa+144):a=140-132=8
7xa+144=8×a
144=8xa-7xa=a
Verificare 7x144+144=8×144
8×144:144=8
8+132=140
140×5=700
700-600=100
400:100=4
4=4 adevărat
